I name my Betta's according to water related things, I have Aquarius right now and I have two males names waiting in the wings. Atlantis because it's very beautiful and Nikola Tesla (okay not water related just my all time favorite scientist.) and then I have one female name which is Veronica, a very normal person name but I just like it.

I named my fish "Kuro-chan" because he is mostly white. I thought it would be fun to name a white betta black. :P then I dropped the chan because it doesnt mean anything in english. So now he's just Kuro :)